Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
  • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
  • A61L15/42—Use of materials characterised by their function or physical properties
  • A61L15/58—Adhesives
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/02—Adhesive bandages or dressings
  • A61F13/0203—Adhesive bandages or dressings with fluid retention members
  • A61F13/0206—Adhesive bandages or dressings with fluid retention members with absorbent fibrous layers, e.g. woven or non-woven absorbent pads or island dressings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/02—Adhesive bandages or dressings
  • A61F13/0203—Adhesive bandages or dressings with fluid retention members
  • A61F13/0223—Adhesive bandages or dressings with fluid retention members characterized by parametric properties of the fluid retention layer, e.g. absorbency, wicking capacity, liquid distribution
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/02—Adhesive bandages or dressings
  • A61F13/0203—Adhesive bandages or dressings with fluid retention members
  • A61F13/0226—Adhesive bandages or dressings with fluid retention members characterised by the support layer
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/02—Adhesive bandages or dressings
  • A61F13/023—Adhesive bandages or dressings wound covering film layers without a fluid retention layer
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/02—Adhesive bandages or dressings
  • A61F13/0246—Adhesive bandages or dressings characterised by the skin-adhering layer
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
  • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
  • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
  • A61L15/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof

Definitions

• the present invention relates to a medical adhesive dressing used for applying to the skin in the field of medical therapy and hygiene. More particularly, the present invention relates to a medical adhesive dressing used advantageously in a first-aid adhesive tape or a large size adhesive tape, a dressing material, a drape material, etc. The present invention also relates to a first-aid adhesive tape having such a medical adhesive dressing.
• Medical adhesive dressings usually include a backing film having an adhesive layer on one surface thereof and upon use it is applied to a desired skin surface through the adhesive layer.
• the backing films for use in an adhesive dressing for use in medical applications are mostly those which comprise flexible polyvinyl chloride as a main component in view of their skin following property (flexibility) while they are applied to the skin, stretchability (contraction and expansion properties), feeling, etc.
• flexible polyvinyl chloride contains a plasticizer in a large amount in order to impart it with flexibility. It has been pointed out some problems. That is, the plasticizer migrates into the adhesive layer of the adhesive dressing so that its cohesion decreases and the phenomenon of adhesive residue or a decrease in adhesion power occurs. Recently, from the viewpoint of placing importance to environment, movement is being developed in various fields for trying as much as possible to reduce the amount of polyvinyl chloride resins, which contain chlorine, a species of halogen harmful to environment.
• polyolefin resins are being given attention as a substitute for polyvinyl chloride resin and study has been made on the usability as the backing film for adhesive dressings for medical use.
• the backing film made of polyolefin resin is excellent in flexibility and stretchability and is useful as a polyvinyl chloride substituted film.
• first-aid adhesive tapes or large-size adhesive tapes are manufactured as having a print layer on one surface of the backing film thereof. That is, usually first-aid adhesive tapes and large-size adhesive tapes are devised such that one surface of the backing film is printed by pattern printing in a color resembling human skin. For example, they are provided with patterns of grids, semi-continuous or continuous crosses, etc. so that the adhesive dressing does not attract attention. Products may also be manufactured with multi-color printing.
• the film before forming a pressure-sensitive adhesive layer thereon is printed and then a pressure-sensitive adhesive layer is formed.
• the backing film Upon forming a print layer, the backing film needs to be unwound (let out) and if the surface is too smooth, the letting out property is aggravated due to the adhesion between the film surfaces, which sometimes results in the breakage of the film as the case may be. Entrapment of air (bubble) when winding up the film increases the possibility of the occurrence of creases in the backing film. Printing on such creases could cause printing failure, such as lack of print, etc.
• the present inventors have found that the surface conditions of at least one of a polyolefin film as a backing film of an adhesive dressing and a printing layer formed thereon influence winding workability and further printability of the resulting film. They have found that these properties can be improved by adjustment of the surface roughness of the backing film. In other words, the present inventors have found that there is an optimal region for the surface roughness of a film surface.
• the present invention provides a medical adhesive dressing comprising a polyolefin-based backing film having a medical pressure-sensitive adhesive layer on one surface thereof and a print layer on the other surface thereof, said adhesive dressing having surface properties that cause no wrinkle upon winding and unwinding thereof.
• the surface properties of said adhesive dressing may be obtained by adjustment of at least one of property of a surface of the backing film on a side where a print layer is to be formed and property of a surface of the backing film on a side where a pressure-sensitive adhesive layer is to be formed.
• the surface of the backing film on the side where a print layer is to be formed preferably has a surface roughness (10-point average roughness) of 2 to 12 ⁇ m.
• the surface of the backing film on the side where a pressure-sensitive adhesive layer is to be formed preferably has a surface roughness (10-point average roughness) of 2 to 40 ⁇ m.
• the surface roughnesses on the both surfaces of the polyolefin-based backing film differ one from the other.
• the surface roughnesses on the both surfaces of the polyolefin-based backing film differ one from the other.
• the surface roughness of the surface of the backing film on the side where a pressure-sensitive adhesive layer is to be formed is preferably greater than the surface roughness of the surface of the backing film on the side where a print layer is to be formed.
• the polyolefin-based backing film may be one of an ethylene-vinyl acetate copolymer film and a three-layer film comprising an ethylene-methyl methacrylate copolymer layer/A-B-A type block copolymer layer/ethylene methyl methacrylate copolymer layer.
• the ethylene-vinyl acetate copolymer may have a vinyl acetate content of 15 to 28% by weight.
• the ethylene-vinyl acetate copolymer may have a weight average molecular weight of 1X10 4 to 1X10 5 , a molecular weight distribution of 4 or less, and a melt flow rate of 3 g/10 minutes or less.
• the A-B-A type block copolymer may be one of a styrene-butadiene-styrene block copolymer and a styrene-isoprene-styrene block copolymer.
• the ethylene-methyl methacrylate copolymer layer may be a layer that contains an ethylene-methyl methacrylate copolymer and low density polyethylene.
• the ethylene-methyl methacrylate copolymer layer may comprise a micro domain structure comprising an ethylene-methyl methacrylate copolymer as a continuous phase and low density polyethylene as a discontinuous phase.
• the print layer may comprise ultraviolet-curing type ink.
• the polyolefin-based backing film may be white in color due to inclusion of a white filler.
• the pressure-sensitive adhesive layer may have a separator applied to one surface thereof.
• the present invention provides a first-aid adhesive tape comprising a medical adhesive dressing as described above and an absorbent pad in a central region of the medical adhesive dressing.
• the polyolefin film that can be used for the medical adhesive dressing includes not only polymers of hydrocarbon based unsaturated monomers, typically polyethylene and ethylene-propylene copolymers but also copolymers of the hydrocarbon based unsaturated monomers with modifier monomers.
• polystyrene resin examples include polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-butene-1 copolymers, ethylene-octene-1 copolymers, ethylene-methyl methacrylate copolymers, ethylene-methacrylic acid copolymers, ethylene-vinyl acetate copolymers, polypropylene-polybutene mixtures, polyethylene-polybutene mixtures. At least one selected from these polyolefin-based resins can be used advantageously.
• the olefin-based film used in the present invention is not only a single-layer film but also a multilayer film.
• a multilayer film it is sufficient for at least one of the unit layers of multilayer is a polyolefin-based film.
• the multilayer film may be of the following construction: polyolefin-based film/modifier resin film, polyolefin-based film/modifier resin film/polyolefin-based film, modifier resin film/polyolefin-based film/modifier resin film, etc.
• Such a modifier resin includes, for example, A-B-A type block copolymers, such as styrene/butadiene/styrene tri-block copolymers and styrene/isoprene/styrene tri-block copolymers.
• those films that can be used advantageously in respect of flexibility and stretchability, appropriate tensile strength and the like include ethylene-vinyl acetate copolymer films, or a three-layer film of a construction: ethylene-methyl methacrylate copolymer layer/A-B-A type block copolymer layer/ethylene-methyl methacrylate copolymer layer.
• the A-B-A type block copolymer is a styrene-butadiene-styrene block copolymer or a styrene-isoprene-styrene block copolymer are more preferable.
• the polyolefin-based film used is an ethylene-vinyl acetate copolymer film
• ethylene-vinyl acetate copolymers that have vinyl acetate contents in the range of 15 to 28% by weight, preferably 20 to 25% by weight, in view of appropriate elasticity, flexibility, and stretchability.
• ethylene-vinyl acetate copolymers that have weight average molecular weights in the range of 1X10 4 to 1X10 5 and relatively narrow molecular weight distributions as low as 4 or less, preferably 3.5 or less.
• ethylene-vinyl acetate copolymers having low flowabilities i.e., having melt-flow rates measured according to JIS K-6730 of 3 g/10 minutes or less in order to impart appropriate tensile strength to the resulting film when they are molded into a film.
• the ethylene-methyl methacrylate copolymer layer that constitutes the above three-layer films is preferably a layer that contains an ethylene-methyl methacrylate copolymer and a low-density polyethylene.
• the film contain a low-density polyethylene, the polyethylene is not compatible with the resin of the film and remains in the film in a finely dispersed state, so that appropriate unevenness is generated in the surface of the film by the fine particles of the low-density polyethylene.
• the resulting film can be imparted high quality feeling and at the same time the adhesion (anchoring effect) to a printing layer to be formed on the surface of the film can be improved.
• the amount of low-density polyethylene to be blended in the ethylene-methyl methacrylate copolymer layer is usually about 5 to about 45% by weight, preferably 15 to 35% by weight, based on the total weight of the ethylene-methyl methacrylate copolymer layer.
• the resin components may be compatible with each other and mixed to form a homogeneous entity.
• the resin components form a so-called micro-domain structure (sea-island structure) rather than the resin components are compatible with each other and are made homogeneous.
• the ethylene-methyl methacrylate copolymer constitutes the matrix (sea) and the low-density polyethylene is dispersed as a discontinuous phase (islands) in the matrix.
• the resin components are rendered homogeneous, it is only possible to obtain films having intermediate properties, or average properties, of the properties that the respective resin components have.
• the above micro-domain structure allows the properties of the respective resin components to be separately exhibited to some extent, so that adjustment of compounding amounts of respective resin components enables to one to obtain desired properties.
• the polyolefin films obtained as described above are molded to have a thickness of about 10 to about 200 ⁇ m, preferably 30 to 130 ⁇ m, before it can be used for the medical adhesive dressing of the present invention.
• a surface of the film on which a pressure-sensitive adhesive layer is formed is preferably subjected to a treatment for improving the anchoring effect upon formation of the pressure-layer sensitive adhesive layer, such as a corona discharge treatment or coating of a known primer.
• a pressure-sensitive adhesive layer is formed on one surface of the above polyolefin.
• the pressure-sensitive adhesive is not particularly limited and may be any one that is used as a pressure-sensitive adhesive for medical use.
• Preferred examples of the pressure-sensitive adhesive include acrylic-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and blends of two or more of them.
• the acrylic-based pressure-sensitive adhesive which can be used are preferably homopolymers of (meth)acrylic acid esters having an alkyl group containing 1 to 18 carbon atoms, preferably 4 to 12 carbon atom, and copolymers that comprise such an ester as a main component monomer and one or more copolymerizable monomers (for example, functional monomer(s), etc.) in amounts in the range of 3 to 50% by weight, preferably 5 to 40% by weight.
• esters such as butyl ester, hexyl ester, octyl ester, decyl ester, lauryl ester, and stearyl ester.
• the ester chain may be linear or branched.
• the monomers copolymerizable with the above esters include functional monomers, or example, (meth)acrylic hydroxyalkyl esters such as (meth)acrylic acid 2-hydroxyethyl ester and (meth)acrylic aid 3-hydroxypropyl ester, carboxyl group-containing unsaturated monomers such as (meth) acrylic acid, maleic acid, fumaric acid and crotonic acid, (meth)acrylamide and derivatives thereof, such as (meth)acrylamide, dimethyl (meth)acrylamide and diethyl (meth)acrylamide, N-alkoxyalkyl (meth)acrylamide such as N-butoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, and N-ethoxymethyl (meth) acrylamide, (meth) acrylic acid N,N-alkylaminoalkyl esters such as (meth) acrylic acid N,N-dimethylaminoethyl ester, acid amide group-containing unsaturated
• Examples of the rubber-based pressure-sensitive adhesive that can be used in the pressure-sensitive adhesive layer may be a blend of a main material resin (such as natural rubber, polyisobutylene, polyisoprene, polybutene, a styrene-isoprene (or butadiene) -based block copolymer, or an ethylene-vinyl acetate copolymer) and a tackifier as a side material (such as rosin-based resin, terpene-based resin, chroman-indene resin, terpene-phenol-based resin, or petroleum-based resin) .
• a main material resin such as natural rubber, polyisobutylene, polyisoprene, polybutene, a styrene-isoprene (or butadiene) -based block copolymer, or an ethylene-vinyl acetate copolymer
• a tackifier such as rosin-based resin,
• Softening agents such as liquid polybutene, mineral oils, lanolin, and liquid polyisoprene, fillers such as titanium oxide and clay, antioxidants such as butyl hydroxytoluene, etc.
• Such a side material may be blended with the acrylic-based pressure-sensitive adhesive.
• the silicone-based pressure-sensitive adhesive used as the pressure-sensitive adhesive includes, for example, a pressure-sensitive adhesive that comprises polydimethylsiloxane as a main ingredient.
• the pressure-sensitive adhesive having the above-described composition is formed on the backing film to a thickness of about 10 to about 200 ⁇ m, preferably 20 to 100 ⁇ m to provide the medical adhesive dressing of the present invention.
• the polyolefin-based film used as a backing film is formed on one surface thereof (opposite to the surface where the pressure-sensitive adhesive layer is formed) with a single color pattern print layer or a multi-color print layer.
• the print layer may be formed with ink of any desired color by known printing means. From the viewpoint of productivity and economy, it is preferred that the print layer be formed by gravure printing.
• the color of printing ink is preferably one resembling the color of skin of humans so that the medical adhesive dressing or their processed products such as first-aid adhesive tapes when applied to the skin surface are inconspicuous.
• the print pattern may be of continuous or discontinuous repetition of the same pattern, such as grids, for example, cross pattern, elliptic, circular, or the like pattern.
• the print layer may be formed by multi-step printing using a plurality of colors, such as cyan, magenta, yellow, black, gold, and silver. It is preferred that ultraviolet curing type ink. Forming a print layer with ultraviolet curing type ink will increase printing speed and printing precision. This is effective particularly for character printing.
• the medical adhesive dressing and first-aid adhesive tape of the present invention is adjusted with respect to the surface roughness of the polyolefin-based film used as a backing film to a specified range. That is, the surface roughness of the backing film on the side where the print layer is formed is adjusted within the range such that wrinkle will not occur when the adhesive dressing is wound or unwound, for example, within the range of a surface roughness (10-point average roughness) of 2 to 12 ⁇ m, preferably 3 to 8 ⁇ m.
• the surface roughness as used herein means 10-point average as measured according to the method prescribed in JIS B0601.
• the above construction ensures an escape for the air entrained between the films when the polyolefin-based film is wound into a roll. As a result, no wrinkle occurs in the film, so that the occurrence of printing failure (non-printing) in a later step due to wrinkle can be prevented.
• the surface roughness of the polyolefin-based film used in the present invention is adjusted to 2 to 12 ⁇ m on the side where a print layer is to be formed as described above.
• the surface roughness of the film is adjusted within a range of 2 to 40 ⁇ m, more preferably 10 to 30 ⁇ m.
• the surface of the film on the side where the medical pressure-sensitive adhesive is to be applied is subjected to corona discharge treatment or priming treatment as described above.
• another approach for increasing the anchoring effect is to increase close contact surface area (adhesion surface area). Accordingly, it is effective to roughen the surface of the polyolefin-based film and an effective surface roughness is 2 ⁇ m or more. If the surface roughness is above 40 ⁇ m, there is the fear that the printing ink cannot be coated thoroughly or uniformly. To balance these factors, a surface roughness of 2 to 40 ⁇ m is acceptable.
• the surface roughnesses on the both surfaces of the polyolefin-based film differ from each other. More preferably, the surface of the film on the side where a medical pressure-sensitive adhesive layer is has a surface roughness greater than that of the surface on the side where a print layer is formed. This is to secure the anchoring of the film with the medical pressure-sensitive adhesive layer.
• the medical adhesive dressing and first-aid adhesive tape of the present invention can be produced by the following method, for example. First method (with a multi-color printing layer)
• a polyolefin-based film is molded to a predetermined thickness by a calendar extrusion method or inflation extrusion method.
• the both surfaces of the resulting polyolefin-based film are roughened by a known means such as an emboss roll, if desired, so that the surface roughness of the film can be adjusted to a predetermined range, e.g., in the range of 2 to 12 ⁇ m.
• a pressure-sensitive adhesive solution for forming a medical pressure-sensitive adhesive layer is applied by a direct transfer method in which the adhesive solution is coated directly on the film and dried.
• the medical pressure-sensitive adhesive solution may be applied to the film by coating the adhesive on a separator having subjected to a separation treatment and dried to form a medical pressure-sensitive adhesive layer of a predetermined thickness and the resulting pressure-sensitive adhesive layered is transferred to the surface of polyolefin-based film.
• the surface of the polyolefin-based film on the side where a pressure-sensitive adhesive layer is to be formed is subjected to corona discharge treatment or priming treatment.
• a medical adhesive dressing of the present invention having on one surface thereof a multi-color print layer.
• a surface of a polyolefin-based film whose surface roughness has been adjusted to, for example, 2 to 12 ⁇ m, is subjected to corona discharge treatment for increasing the adhesion before printing, if desired.
• corona discharge treatment for increasing the adhesion before printing, if desired.
• on the surface of the film is coated printing ink using ultraviolet-curing ink.
• the ink is dried and cured to obtain the medical adhesive dressing of the present invention having on one surface thereof a multi-color print layer.
• the polyolefin-based film is molded to a predetermined thickness by calendar extrusion method or inflation extrusion method.
• the both surfaces of the resulting polyolefin-based film if desired, is roughened to a specified surface roughness range, for example, in the range of 2 to 12 ⁇ m, by a known means such as an emboss roll.
• printing ink which is dried to form a medical adhesive dressing of the present invention having on one surface thereof a single color pattern print layer.
• the printing surface be subjected to corona discharge treatment in advance.
• a pressure-sensitive adhesive solution for forming a medical pressure-sensitive adhesive layer is applied by a direct transfer method in which the adhesive solution is coated directly on the film and dried.
• the medical pressure-sensitive adhesive solution may be applied to the film by coating the adhesive on a separator having subjected to a separation treatment and dried to form a medical pressure-sensitive adhesive layer of a predetermined thickness and the resulting pressure-sensitive adhesive layered is transferred to the surface of polyolefin-based film.
• the surface of the polyolefin-based film on the side where a pressure-sensitive adhesive layer is to be formed is subjected to corona discharge treatment or priming treatment.
• an absorbent pad such as gauze, non-woven fabric, woven fabric, foamed resin or the like is provided in a central region on the surface of the pressure-sensitive adhesive layer of the above-produced medical adhesive dressing (raw fabric) . Further one or two separators are laminated thereon and the resulting composite is cut to a predetermined shape.
• the first-aid adhesive tape of the present invention can be obtained.
• the medical adhesive dressing and first-aid adhesive tape of the present invention use a polyolefin-based film having a specified surface roughness. Therefore, they can exhibit such properties desired for medical adhesive dressing, such as flexibility and stretchability, satisfactorily enough to serve as substitutes for the conventional medical adhesive dressings that use polyvinyl chloride-based films.
• the medical adhesive dressing of the present invention has various effects that in particular, upon forming a print layer, no wrinkle occurs and excellent workability is obtained. At the same time, no printing failure results attributable to the occurrence wrinkles. Further the abrasion of print layer when in use is minimized.
• ethylene-vinyl acetate copolymer having a vinyl acetate content of 25% by weight was added 1 part by weight of a fatty acid-based lubricant and the mixture was molded into a sheet of about 80 g/m 2 by a calendering method at a temperature of 100 to 140°C.
• the resulting sheet was pressed by a roll having a surface roughness of about 5 ⁇ m on its surface on the side where a print layer was to be formed. Also, it was pressed by a roll having a surface roughness of about 5 ⁇ m on its surface on the side where a pressure-sensitive adhesive layer was to be formed.
• a polyolefin-based backing film was prepared.
• a monomer mixture consisting of 85 parts by weight of isononyl acrylate, 12 parts by weight of vinyl acetate, and 3 parts by weight of acrylic acid was dissolved in 60 parts by weight of ethyl acetate.
• a separator was separation-treated with a silicone resin on one surface thereof and on the thus-treated surface was coated the above-prepared medical pressure-sensitive adhesive solution to a thickness (dry basis) of 35 ⁇ m and dried to form a medical pressure-sensitive adhesive.
• one surface of the polyolefin-based film prepared as described above was subjected to corona discharge treatment and a polyolefin backing film as pressed on the surface of the medical pressure-sensitive adhesive such that the treated surface contacted the medical pressure-sensitive adhesive layer to prepare a medical adhesive dressing.
• the resulting medical adhesive dressing on the side where a print layer was to be formed was applied a character print by multi-color printing. Thereafter, the medical adhesive dressing was processed into a first-aid adhesive tape.
• the first-aid adhesive tape of the present invention was prepared.
• Three-layer lamination sheet (thickness ratio: 20%/60%/20%) was molded by three-layer simultaneous inflation method at a temperature of 150 to 200°C so that the following layer arrangement was obtained. That is, a sheet of 100 parts by weight of ethylene-methyl methacrylate having a methyl methacrylate content of 25% by weight was positioned on the side where a print layer was to be formed. Then a sheet of 100 parts by weight of styrene-butadiene-styrene block copolymer having a melt flow rate of 2 g/10 minutes and 1 part by weight of butylhydroxytoluene was placed as an intermediate layer. Finally, a sheet of ethylene-methyl methacrylate copolymer having a methyl methacrylate content of 25% by weight was positioned on the side where a medical pressure-sensitive adhesive layer was to be prepared.
• a first-aid adhesive tape was prepared using a medical pressure-sensitive adhesive in the same manner as in Example 1 except that the above-prepared polyolefin-based backing film was used.
• a three-layer film was prepared in the same manner as in Example 2 except that as the intermediate layer was used a sheet of 100 parts by weight of styrene-isoprene-styrene block copolymer having a melt flow rate of 3 g/10 minutes, 1 part by weight of butylhydroxytoluene and 5 parts by weight of titanium oxide.
• a first-aid adhesive tape was prepared using a medical pressure-sensitive adhesive in the same manner as in Example 1 except that the above-prepared polyolefin-based backing film was used.
• ethylene-vinyl acetate copolymer having a vinyl acetate content of 25% by weight was added 1 part by weight of a fatty acid-based lubricant and 5 parts by weight of titanium oxide.
• the mixture was molded into a sheet of about 80 g/m 2 by a calendering method at a temperature of 100 to 140°C.
• the resulting sheet was pressed by a roll having a surface roughness of about 5 ⁇ m on its surface on the side where a print layer was to be formed. Also, it was pressed by a roll having a surface roughness of about 20 ⁇ m on its surface on the side where a pressure-sensitive adhesive layer was to be formed.
• a polyolefin-based backing film was prepared.
• a first-aid adhesive tape was prepared using a medical pressure-sensitive adhesive in the same manner as in Example 1 except that the above-prepared polyolefin-based backing film was used.
• Example 4 the sheet prepared in Example 4 was pressed by a roll having a surface roughness of about 10 ⁇ m on its surface on the side where a print layer was to be formed. Also, it was pressed by a roll having a surface roughness of about 5 ⁇ m on its surface on the side where a pressure-sensitive adhesive layer was to be formed. Thus, a polyolefin-based backing film was prepared.
• a first-aid adhesive tape was prepared using a medical pressure-sensitive adhesive in the same manner as in Example 4 except that the above-prepared polyolefin-based backing film was used.
• a first-aid adhesive tape was prepared in the same manner as in Example 4 except that the both surfaces of the polyolefin-based backing film was pressed by a mirror surface to obtain a very smooth surface (surface roughness of about 1 ⁇ m).
• a first-aid adhesive tape was prepared in the same manner as in Example 4 using the same medical pressure-sensitive adhesive as in Example 4 except that the polyolefin-based film was prepared by pressing the sheet obtained in Example 4 at a temperature of 70 to 120°C, by a roll having a surface roughness of about 20 ⁇ m on its surface on the side where a print layer was to be formed and by a roll having a surface roughness of about 5 ⁇ m on its surface on the side where a pressure-sensitive adhesive layer was to be formed.
• the surface roughness of a polyolefin-based film was measured according to JIS B0601.
• Surf Test 501 manufactured by Mitsutoyo Co., Ltd. and 10-point average roughness was obtained at a standard length of 0.8 mm.
• ultraviolet-curing type ink was coated on a surface of each medical adhesive dressing using a commercially available printing apparatus.
• the ink was cured to apply the surface a 4-color character print. Then, judgment was made if the character could be printed sharply. Criteria for the judgment were as follows.
• Examples 1 to 5 and Comparative Examples 1 and 2 medical adhesive dressings were prepared in the same manner as in Example 1 except as follows. That is, instead of applying multi-color print after a pressure-sensitive adhesive layer was applied, first the surface of the polyolefin-based film on the side where a print layer was to be formed was subjected to corona discharge. Then, a grid pattern skin color print was applied using a gravure coater. This was subjected to corona discharge treatment on the surface where a pressure-sensitive adhesive layer was to be formed. Then, the polyolefin-based backing film was pressed on the surface of the above medical pressure-sensitive adhesive layer such that the treated surface contacted the medical pressure-sensitive adhesive layer. This medical adhesive dressing was used to prepare the first-aid adhesive tape of the present invention.

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• 2000
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